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Black holes occur when supernovas explode, leaving their remnants of the core; a neutron star. If this is heavy enough, it will become a black hole.

Nothing, not even light, can escape a Black Hole. So, obviously, we cannot see them with our own eyes or through our telescopes, but Black Holes are found by their gravitational affect on other stars around them, and tell tale signs of accretion discs (where a companion star is being pulled apart by the hole's gravity) circling around it. Steady X ray and gamma rays are produced by a black hole also.

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16y ago

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